Muffler



March 22, 1938. M. H. ABRAMSON MUFFLER Filed Dec. l2, 1936 'MU/@Hy HABRAMSON @mug Patented Mar. 22, 1938 UNITED ASTATES PATENT OFFICE 7 Claims.

This invention relates to improvements in mufflers and is particularly adapted to mufflers used in conjunction with internal combustion engines.

It is an aim of the present invention to provide a muffler of the character described having various features of novelty and advantage and which isparticularly characterized by its extreme simplicity in construction, economy in manufacture, and effectiveness of operation, as

well as the ease and facility with which the parts may be assembled.

It is a further object of this invention to provide a muffler wherein the flow of exhaust gases is directed in a substantially spiral path therethrough.

It is a further object to provide a muffler having a plurality of spaced baffles so constructed that carbon and solid particles in the exhaust gases will not tend to pocket between the baffles but will be carried into the flow of exhaust gases and ejected from the muffler.

Other objects will be in part obvious and in part pointed out more in detail hereinafter.

The invention accordingly consists in the features of construction, combination of elements and arrangement of parts which will be exemplified in the construction hereafter set forth and the scope of the application of which will be indicated in the appended claims.

In the accompanying drawing wherein like parts are indicated by like numerals:

Figure 1 is a perspective view of my muffler which is partly broken away to show its construction; and

Figs. 2, 3, 4, and 5 are cross sectional views taken through the muffler showing the position of the cut away portions of successive baffles and the flow of exhaust gases.

Referring to the drawing illustrating one embodiment of my invention, I have provided an elongated muffler generally rectangular in form and having a plurality of spaced baffles extending thereacross. Exhaust gases enter through one end of the muffler and are directed in a spiral path through the muflier by having the successive corners of the baffles cut away. The bottom corners of the bafes may also be cut away so that carbon and solid particles within the exhaust gases will not be trapped in the cavities between the bales, but will be caught up in the spiral flow of gases and ejected from the muffler.

The muffler has rectangular end plates I 0 which are duplicate in construction and provided with central apertures I0 therethrough. These apertures may be threaded or provided with other (Cl. ISL-49) suitable means whereby pipes of an exhaust system may be connected to the mufer. An outer casing I I formed of sheet metal surrounds plates I0 providing an elongated rectangular box having opposed side walls I2 and top and bottom walls I3. For convenience of assembly, casing II is formed of two elongated angles, each having a pair of connected walls l2 and I3. The ends of walls I2 and I3 are bent over, as at I2 and I3', and bevelled, as at I4, to overlie the edges of plates I0. The outer edge of each wall I3 terminates in a bent over lip I5 arranged to overlie an edge of the adjacent side wall I2. Plates I0 may be suitably secured in position, as by spot welding to bent over portions I2 and I3', and lips I5 may be similarly secured to the side walls, thus providing a rigid and substantially integral structure.

The baffles, herein illustrated by the letters a, b, c, d, and e, may be duplicate in construction and are formed from rectangular sheets of metal separating the muilier into a series of intercommunicating chambers A, B, C, D, E, and F through which the exhaust gases iiow in a generally spiral path. In the present instance, five baffles are illustrated dividing the muffler into six chambers, but it will be appreciated that any number of baffles may be employed dependent on the flow of exhaust gases to be controlled. Each ofthe baffles has a corner cut away, as at a', b', c', etc., and the baies are so positioned within casing I I that these cut away portions are successively and progressively disposed to opposite sides of the rectangular casing, thus directing the gases in a generally spiral path which follows the inner casing walls, as indicated in Fig. 1. These out away portions on the baffles provide apertures between the successive baffles and the casing walls through which the exhaust gases may ow in an advancing path through the successive l chambers, and the apertures are preferably of such area that substantially no back pressure is set up within the exhaust system.

Each of the baffles is further cut away at its other corners, as at a, b", c, etc., so that two apertures will be provided at each of the bottom corners of each baffle, and carbon or other solid substances which will normally tend to become pocketed in the bottom of the chambers will be caught up in the ow of exhaust gases and be s ejected from the muffler. These cut away corners a, b, c, etc., will also aid the circulation of gases in the muler causing a swirling motion of gases in each chamber, thus giving a more effective muler operation. I preferably provide these smaller cut away portions on three corners of each baille so that the baffles may be made in duplicate and assembled with the apertures a', b', etc., in the desired respective positions.

To secure the baffles in desired spaced relation throughout the length of the mufller, I provide spaced grooved portions I6 correspondingly located in each of the side walls and adapted to overlie and slidably receive the opposed side edges of each baille, thus firmly securing the baffles in position. Grooves I6 terminate before reaching lips l5 so that the lips may lie in flat sealing engagement with the side walls I2 and the cut away portions of the baffles are of such extent that the entire side edge of each baille is completely received in a groove.

In the assembly of my device, it is simply necessary to align each half of the casing so that the grooves I6 receive the edges of the baffles in desired relation, after which the casing may be pushed into assembled position and spot welded in a few positions to hold the parts assembled. Hence, it will be appreciated that I have provided a muffler which is inexpensive to manufacture, easy to assemble, and efficient in operation.

As many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the language used in the following claims is intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

I claim as my invention:

l. A muffler comprising an elongated hollow rectangular casing, end walls in the casing, each of said walls having an aperture therethrough, a plurality of spaced baflles extending across the casing and dividing it into successive rectangular chambers, and said baffles being respectively cut away on successive corners whereby gases may communicate between said chambers and will be directed in a spiral flow through the muffler.

2. In a muffler, a rectangular casing7 end walls in the casing having apertures therethrough communicating with an exhaust system, a plurality of duplicate interchangeable baffles supported in spaced relation within the casing and transversely extending thereacross, means on the casing engaging said baffles and rigidly securing them in position, each baffle having a cut away corner portion providing an aperture between the baffle and the casing through which exhaust gases may flow, said cut away portions being progressively located at successive corners of the casing and directing the gas flow through the muffler in a substantially spiral advancing path.

3. A muffler comprising an elongated rectangular casing, end walls in the casing and respectively provided with admission and exhaust openings, the opposite walls of said casing having opposed grooves, baffles received in said grooves and each having a cut away corner portion, said cut away portions being located progressively to opposite corners of the casing so that a gas flow will be directed through the mufller and around the baflles in a substantially spiral path.

4. In a muffler, a rectangular elongated casing, end walls in said casing having apertures therethrough adapted to communicate with an exhaust system, a plurality of. substantially rectangular baffles secured within the casing in spaced relation and extending thereacross, each of said baffles having a corner portion cut away so that gases may flow through the muffler, said successive cut away portions being progressively located with respect to the corners of the casing and directing the gas flow in a spiral path through the muffler, and a cut away portion at one of the bottom corners of each baffle whereby solid particles will not pocket within the bottom of the muffler but will be picked up in the exhaust flow and blown out of the muffler. l

5.'A muffler comprising an elongated, rectangular casing, said casing being composed of two interfitting angles and providing substantially opposed side walls and top and bottom walls, end walls in the casing, each end wall having a central aperture therethrough and adapted to be connected within an exhaust system, and a plurality of interchangeable spaced substantially rectangular baffles within the casing and transversely dividing it into successive chambers, said baffles being cut away on successive corners whereby gases will communicate between said chambers and flow through the muffler adjacent the inner walls of said casing in a progressive, substantially spiral path.

6. A muffler comprising a rectangular sheet metal casing, said casing being composed of two duplicate interfitting angles and providing parallel opposed top and bottom walls and parallel opposed side walls, end walls in said casing having central apertures therethrough adapted to communicate with an exhaust system, the ends of said casing being bent into overlying relation with and secured to said end walls, said side walls having a plurality of correspondingly located grooves extending generally between the top and bottom walls, rectangular baflles within the casing and slidably received within corresponding grooves to divide the muffler into successive chambers, each of said baffles being duplicate in construction and having a cut away corner portion providing communication between successive chambers, said cut away portions on said successive bales being located at progressive corners of the casing whereby gases will flow through the mufller in a spiral path.

7. A muffler comprising an elongated hollow rectangular casing, end walls in the casing respectively provided with admission and exhaust openings, a plurality of interchangeable spaced rectangular baffles within the casing and dividing it into a series of chambers, each of said baffles having cut away portions at its corners providing communication between adjacent chambers, one of the cut away portions on each baffle being of considerably greater extent than said other cut away portions, said baffles being so positioned within the casing that the greater cut away portions will successively lie in progressive relation to each other and direct the exhaust gases through the muffler in a substantially spiral path, said other cut away portions in each baille serving to create eddy currents within the muffler whereby solid particles carried into the muffler will not become pocketed therein.

MURRY H. ABRAMSON. 

